Blackboard-eraser and method of making same.



R. A. COSTELLO. BLACKBOARD ERASER AND METHOD OF MAKING SAME. APPLICATION FILED APR. 4. I917.

Patented Sept. 3, 1918'.

n arnnr opinion.

To all whom it may concern:

Be it known that I, RICHARD A. COSTELLO,

a citizen of the United States, and a resident I of Chicago'Heightsin the countyof Cook,

State of Illinois, have invented certain new and useful Improvements in Blackboard- Erasers and Methodsof Making Same, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to blackboard erasers of the type ordinarily comprising a back of wood, fiber or other comparatively stiff material provided with a comparatively soft pad of erasive material. My invention further includes the method by which the new and improved form of pad is produced and which permits them to be made very cheaply and with great rapidity and facility. It is one of the objects of the invention to produce an erasive pad having the proper resiliency for erasing while at the same time leaving the required strength and rigidity to prevent its becoming distorted or disarranged from normal condition in ordinary use. It is another object of my invention to improve erasers in sundry details hereinafter pointed out. The preferred means by which I have accomplished my several objects are illustrated in the drawings and are hereinafter specifically described. That which I believe to be new and desire to cover by this application is set forth in the claims.

In the drawings:

Figure 1 is a bottom face view of the pre ferred form of my improved eraser;

Fig. 2 is a side view of the eraser shown in Fig. 1;

Fig. 3 is an edge view of the strip of felt or other suitable material ready to be given the desired pad form;

Fig. 4 is a face view of the strip shown in Fig. 3; and

Fig. 5 illustrates a modified form of pad in the course of construction, comprising two short strips inclosed by the long strip as is illustrated in Fig. 1. but with the stitching omitted between the long strip and the two short strips.

Referring to Figs. 1 to 4 in which corresponding parts are indicated by the same reference characters- 10 indicates a back which in the construction shown is formed of a still piece of felt, but which may be made of any other suit- Specification of Letters Patent.

ILLINOIIS.

IBLACKBOABD-ERASEIR, AND METHOD OF MAKING SAME.

Patented Sept. 3, i918.

Application filed April 4, 1917. Serial No. 159,811.

able material having the desiredrigidity for supporting the pad which ispreferably secured thereto by. means of glue. The pad, in the construction shown in Figs. 1 and 2, comprises a strip of comparatively soft felt 11 havingsecured to opposite faces near its end portions respectively other strips of soft felt 12-13. In the construction shown the strips 12-13 are secured to the strip 11 by means of stitching as at 14.

WVit-h the strips 1213 secured upon the strip 11 as is shown in Fig. 3, the pad as shown in Fig. 1 can be very readily and very quickly produced. By grasping the strip 11 near the outer ends of the short strips 1213, the pad may be brought to the folded condition as shown in Fig. 1 by a single movement of the operators hands toward each other, after which the folded pad may be readily placed in an appropriate form for the subsequent operation of applying the back thereto.

In Fig. 5, the corresponding parts are in dicated by the same reference characters, but with the addition of an exponent a. the only difference being the omission of the stitching 14. The omission of the stitching 14 detracts somewhat from the readiness with which the pad can be given its folded form, and decreases to some extent the ability of the pad to stand up under severe usage.

By the use of my improved form of pad comprising a strip reversely wound at its end portions about two shorter strips, I am enabled to produce erasers more cheaply than can be done by the use of pads of the type heretofore provided. By the use of the pad formed of a long strip with the two shorter strips stitched in position thereon. a pad of the desired rigidity is provided without unduly detracting from its efficiency as an eraser. So far as I am aware. I am the first in the art to providean eraser comprising a plurality of thicknesses of strip material with means for securing the outer two thicknesses together at each side independently of the remaining thicknesses. and my claims are to be construed accordingly. It will be understood that I do not wish to limit myself to the particular means shown for securing the shorter strips to the longer strip or to the expedient of securing the shorter strips near their middle points. except as is hereinafter specifically claimed.

What I claim as my invention and desire to secure by Letters Patent, is

1. A method of making eraser pads c011- sisting in arranging relatively short strips of erasive material on opposite sides and near the opposite ends of a relatively long strip of erasive material, reversely folding each end of the long strip about one end of the respective short strips, folding the portions of the long strip covered by the short strips over the central portion of the long strip With the folded over end portions of the long strip positioned against the central portion of the long strip, and then securing the parts in said relation.

' 2. A method of making eraser pads con- I sisting in securing relatively short strips of Copies of this patent may be obtained for erasive material 011 opposite sides of a relatively long strip of erasive material and adjacent the ends of the latter, in folding said long strip upon itself to envelop the shorter strips by reversely bending its end portions with a Winding motion, and in finally moving the folded portions into juxta relation and securing them in said relation.

3. In a blackboard eraser," the combination of a back, and a pad secured thereto, said pad comprising a plurality of thicknesses of strip material the outer two thicknesses of which at each side are secured together intermediate the ends of the pad and independently of the remaining thicknesses.

RICHARD A. COSTELLO.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0." i 

